Sofa



FIG. 1 is a perspective view of a sofa showing my new design from the front and left end;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left end elevational view thereof, the right end being a mirror image thereof; and,

FIG. 4 is a rear elevational view thereof.

The bottom is plain and unornamented. 

The ornamental design for a sofa, as shown and described. 